Peridot Period App

Just a period tracker. Pay once. Yours forever.

Peridot does one thing: it tracks your period and tells you when the next one is coming. No articles, no quizzes, no streaks, no subscription. Pay $9.99 once and it's yours.

It isn't a fertility app, a pregnancy planner, or a wellness magazine. If you want a calm calendar, a countdown, and an honest prediction, this is it.

WHAT YOU GET
• A calendar that shows every logged period and the predicted next one at a glance
• A countdown to your next period, front and center
• One-tap logging for today, or any date you missed
• Your current phase, shown as a gentle estimate
• A clean history of every cycle, editable any time

PREDICTIONS THAT ADMIT WHAT THEY DON'T KNOW
Peridot learns your personal rhythm from the periods you log. Recent cycles count a little more so it trends with your body, and no cycle is ignored for being unusual. You get a single most-likely day plus an honest window that tightens as it learns you. Regular cycles, tight window. Irregular cycles, wider window. No false confidence.

PAY ONCE. THAT'S IT.
$9.99, one time. No subscription, no free trial that turns into a charge, no premium tier hiding the good parts. You buy it, you own it.

YOUR DATA STAYS YOURS
Everything you log lives on your device. There's no Peridot account and no Peridot server, so your data never reaches us. No analytics, no trackers, no ad networks.

QUIET BY DESIGN
• Notifications are off until you turn them on, and there are only two: period expected soon, and period expected today
• Optional Face ID lock
• Export your full history as a CSV any time. You paid once; you can walk away with your data.

ONE THING, DONE BEAUTIFULLY
A calendar, a dot, and a number. That's the whole app.

No ads. No subscriptions. Peridot. Period.

Phases are estimates derived from the cycles you log and may be inaccurate. Peridot is not a contraceptive or conception tool.